Hmm...Really? That's not good. I assume that when you say '1.6' your referring to the RAM speed of 1600MHz and not the voltage of 1.6?
Vengeance® Low Profile — 8GB Dual Channel DDR3 Memory Kit (CML8GX3M2A1600C9) I checked which RAM you have by looking at an old dump file. You'll notice in the link above that your sticks will default to 1333mhz @ 1.5v. They have also been tested to run at the rate of 1600MHz @ 1.5v and in order to achieve this speed you either use the X.M.P. profiles or manually overclock.
This is normal practice. Your motherboard manual will tell you how to correctly configure XMP.
Now if you tried to manually overclock the sticks to 1.6mhz or 1600mhz and they crashed constantly then that is not good at all and the sticks could well be faulty.
What about if you returned the sticks beck to the default speed of 1333mhz and then tried enabling the XMP profile. As I wrote above your manual will tell you how and if you haven't got one download another from the motherboard link in earlier posts.